57mm Series 2 Phase Close-loop Stepper Motor  Step accuracy: 5% Temperature: 80℃Max Ambient temperature: -20℃-+50℃ Insulation resistance: 100MR Min 500VDC Pressure resistance: 500VAC 1 minute Radial runout: Maximum 0.02mm (450g load) Axial runout: Maximum 0.08mm (450g load) Specification Model Step Angle (°） Motor Lenth (L) Holding Torque (N.m) Rated Current (A) Resistance (Ω） Inductance (mH) Rotor Inertia (g.cm²） Weight (kg) YK257EC56E1 1.8 78 1.2 4.0 0.44 1.4 280 0.72 YK257EC76E1 1.8 98 2.0 5.0 0.4 1.7 480 1.06 YK257EC80E1 1.8 103 2.2 5.0 0.43 1.8 520 1.15 Suitable drive model: SSD2205M Dimensions Dimensions Model Shaft Diameter D (mm) Shaft Type (mm) Shaft Length L1 (mm)  YK257EC56E1 8 Flat 0.5*15 21 YK257EC76E1 8 Flat 0.5*15 21 YK257EC80E1 8 Flat 0.5*15 21 Encoder Wiring Black GND Red +5V Blue/White EA- Blue EA+ Orange/White EB- Orange EB+ *Motor / Encoder cable: 0.3m Motor standard cable: 1.5m (optional 2m/3m) Encoder standard cable: 1.5m (optional 2m/3m) Motor connection